<div class="ant-select-dropdown-menu-item-group-title">
  <ng-container *ngIf="isLabelString; else labelTemplate">{{nzLabel}}</ng-container>
  <ng-template #labelTemplate>
    <ng-template [ngTemplateOutlet]="nzLabel"></ng-template>
  </ng-template>
</div>
<ul class="ant-select-dropdown-menu-item-group-list">
  <ng-content select="nz-auto-option"></ng-content>
</ul>
